Trump authorized airstrikes in Syria on Friday in retaliation for an apparent chemical weapons attack the U.S. has blamed on Syrian leader Bashar Assad. Nadler said he agreed with the measure but said Trump needed to get congressional approval for such an action.

Nadler resurfaced several old Trump tweets in which he slammed former President Obama for authorizing similar airstrikes.

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“The President must get Congressional approval before attacking Syria-big mistake if he does not!” Trump tweeted in August 2013.

“What will we get for bombing Syria besides more debt and a possible long term conflict? Obama needs Congressional approval,” Trump wrote in another tweet around the same time.

The President must get Congressional approval before attacking Syria-big mistake if he does not!

Nadler called Assad a “monster who committed war crimes against his own people" but said that doesn't give Trump the authority to retaliate without informing Congress.

“As I said in 2013, under Pres. Obama, Constitution requires congressional authorization for use of military force in Syria,” Nadler tweeted. “Previous 9/11-related authorization doesn’t cover strike on Syrian gov’t. @realDonaldTrump's actions tonight appear to be unlawful if not unconstitutional."

As I said in 2013, under Pres. Obama, Constitution requires congressional authorization for use of military force in Syria. Previous 9/11-related authorization doesn't cover strike on Syrian gov't. @realDonaldTrump's actions tonight appear to be unlawful if not unconstitutional.